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- Title
Effective skeleton stress and void ratio for constitutive modeling of fiber-reinforced sand.
- Authors
Gao, Zhiwei; Lu, Dechun; Huang, Mian
- Abstract
Inclusion of flexible fibers such as polypropylene and polyester is an effective method for soil improvement, as it significantly enhances the soil strength and ductility. A proper constitutive model is essential for assessing the stability and serviceability of fiber-reinforced slopes/foundations. A new method for constitutive modeling of fiber-reinforced sand (FRS) is proposed. It assumes that the strain of FRS is dependent on the deformation of the sand skeleton only, while the effective skeleton stress and effective skeleton void ratio, which should be used in describing the dilatancy, plastic hardening and elastic stiffness of FRS, are affected by fiber inclusion. The effective skeleton stress is dependent on the shear strain level, and the effective skeleton void ratio is affected by the fiber content and sample preparation method. A critical state FRS model in the triaxial stress space is proposed using the concept of effective skeleton stress and void ratio. Four parameters are introduced to characterize the effect of fiber inclusion on the mechanical behavior of sand, all of which can be easily determined based on triaxial test data on FRS, without measuring the stress–strain relationship of individual fibers. The model is validated by triaxial compression test results on four fiber-reinforced sands under loading conditions with various confining pressures, densities and stress paths. Potential improvement in the model for incorporating fiber orientation anisotropy is discussed.
- Subjects
SAND; SKELETON; POLYESTER fibers; FIBER orientation; POLYPROPYLENE fibers; SHEAR strain; SILT
- Publication
Acta Geotechnica, 2020, Vol 15, Issue 10, p2797
- ISSN
1861-1125
- Publication type
Article
- DOI
10.1007/s11440-020-00986-w